TiO2-ZnS Cascade Electron Transport Layer for Efficient Formamidinium Tin Iodide Perovskite Solar Cells

Weijun Ke, Constantinos C. Stoumpos, Jenna Leigh Logsdon, Michael R. Wasielewski, Yanfa Yan, Guojia Fang, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticle

122 Scopus citations

Abstract

Achieving high open-circuit voltage (Voc) for tin-based perovskite solar cells is challenging. Here, we demonstrate that a ZnS interfacial layer can improve the Voc and photovoltaic performance of formamidinium tin iodide (FASnI3) perovskite solar cells. The TiO2-ZnS electron transporting layer (ETL) with cascade conduction band structure can effectively reduce the interfacial charge recombination and facilitate electron transfer. Our best-performing FASnI3 perovskite solar cell using the cascaded TiO2-ZnS ETL has achieved a power conversion efficiency of 5.27%, with a higher Voc of 0.380 V, a short-circuit current density of 23.09 mA cm-2, and a fill factor of 60.01%. The cascade structure is further validated with a TiO2-CdS ETL. Our results suggest a new approach for further improving the performance of tin-based perovskite solar cells with a higher Voc.

Original languageEnglish (US)
Pages (from-to)14998-15003
Number of pages6
JournalJournal of the American Chemical Society
Volume138
Issue number45
DOIs
StatePublished - Nov 16 2016

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'TiO<sub>2</sub>-ZnS Cascade Electron Transport Layer for Efficient Formamidinium Tin Iodide Perovskite Solar Cells'. Together they form a unique fingerprint.

  • Cite this